I have a 97 Impreza OBS with the 2.2L engine. About 11 days ago I was half way through a 2 hour drive back home on the freeway and I decided to pull off and get something out of the trunk and I left the car idling. While back there I heard the cooling fan kick on and when I got back in I saw the temp had rising to maybe 3/4 of the way up the gauge. I drove maybe 50 feet further to get under some better lighting and the temp immediately dropped back. When I popped the hood I could see that the coolant overflow bottle was full and had probably already spit out some coolant. I kept a close eye on the temperature the rest of the way home and it stayed stable right where it normally is but the coolant level was definately low after I got home and let the engine cool off. I topped it off and have been keeping an eye on it but today my wife mentioned that she heard a gurgling sound when she started it in the morning and sure enough it was low again. I'm NOT seeing any bubbles coming up through the overflow bottle so I don't think it's a head gasket. I should mention that maybe a week before this incident I had noticed that the engine seemed to be idling just a little less smooth than normal. It is due for another timing belt and I thought maybe the old one had stretched a bit throwing off the timing.
My two theories at this point are A) loose timing belt slipping a bit on the water pump or B ) radiator cap. Any thoughts?
Edited by nmos, 01 May 2014 - 12:25 AM.